Eletriptan and Amitriptyline: Interaction Details
AI-assisted, pharmacist-reviewed · AI content regenerated Jul 11, 2026 · Source data updated Jul 2, 2026 · Sources: FDA labeling, DDInter 2.0, cited literature
Amitriptyline
Eletriptan
How we grade severity & evidence
Severity levels
- Contraindicated: These should generally not be used together.
- Major: Potentially serious — often needs a change or close monitoring.
- Moderate: Can be significant — usually manageable with monitoring.
- Minor: Usually limited clinical impact.
Evidence grades
- Established: Well documented — supported by controlled studies or strong clinical data.
- Probable: Good supporting evidence, though not definitively proven.
- Suspected: Some evidence suggests this interaction, but it is not well established.
- Possible: Limited or conflicting evidence; the interaction may occur.
- Theoretical: Predicted from the drugs' pharmacology; not yet confirmed in people.
Ratings come from the documented interaction literature and are reviewed by a pharmacist. They describe the documented risk of the combination, not what will necessarily happen to you — your dose, timing, and health picture all matter.
Amitriptyline (Elavil) is an antidepressant and eletriptan (Relpax) is a migraine medicine. Both of these raise levels of a brain chemical called serotonin. When you take them together, serotonin can build up too much, which in rare cases can lead to a reaction called serotonin syndrome.
Signs to watch for include shivering, muscle twitching or stiffness, a fast heartbeat, sweating, fever, agitation, or feeling confused. This is uncommon, and many people take both safely. The good news is your care team can manage this by keeping an eye on you, especially when you first start or change a dose. If you notice these symptoms, call your doctor right away.
Interaction: Additive serotonergic effects from concurrent amitriptyline (TCA with serotonin reuptake inhibition) and eletriptan (5-HT1B/1D agonist), theoretically increasing risk of serotonin syndrome.
- Mechanism: Pharmacodynamic (additive serotonergic activity), not a PK/enzyme interaction. Neither agent is a prodrug relevant here.
- Direction: Increased serotonergic effect.
- Severity/Evidence: Major severity, but evidence is theoretical; onset unspecified.
- Monitoring: Neuromuscular (clonus, hyperreflexia, tremor, rigidity), autonomic (tachycardia, hyperthermia, diaphoresis, mydriasis), and mental status changes, particularly at initiation and dose escalation.
If serotonin syndrome develops, discontinue offending agents and provide supportive care.
What happens
An increased risk of serotonin syndrome (hypertension, hyperthermia, myoclonus, mental status changes)
Interaction Deep Dive
Eletriptan and amitriptyline, the latter being a serotonin reuptake inhibitor2, both exert influence on serotonergic neurotransmitter systems. Because their serotonergic actions are additive and may heighten the likelihood of serotonin syndrome, caution is advised when the two are taken together. When eletriptan and amitriptyline are administered concurrently, it is recommended to watch for the signs and symptoms of serotonin syndrome throughout treatment as well as whenever the dose is raised 3. The manifestations of serotonin syndrome encompass neuromuscular abnormalities (for example, hyperreflexia, tremor, muscle rigidity, clonus, peripheral hypertonicity, and shivering), autonomic hyperactivity (for example, tachycardia, mydriasis, diaphoresis, and diarrhea), and alterations in mental status (for example, agitation and delirium). This condition has the potential to be life-threatening. Should serotonin syndrome occur, the responsible agents should be stopped, and supportive care along with any other needed therapy should be given 1.
Why it happens (mechanism)
Additive serotonergic effect
How to manage this interaction
You can usually take both, but your care team will use caution and watch you more closely, especially when starting either drug or increasing a dose.
- Keep taking both as prescribed unless your doctor or pharmacist tells you otherwise.
- Doses may be adjusted and individualized by your care team.
- Learn the warning signs: shivering, muscle twitching or stiffness, fast heartbeat, sweating, fever, agitation, or confusion.
- Seek help right away if these symptoms appear, as serotonin syndrome can be serious.
Ask your pharmacist or prescriber before adding any new serotonin-affecting medicine.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Eletriptan and Amitriptyline together?
Taking amitriptyline and eletriptan together can slightly raise the risk of serotonin syndrome, so watch for symptoms like tremor, sweating, fever, or confusion and get help fast if they occur. Keep taking both as prescribed and let your care team monitor you. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Eletriptan and Amitriptyline interaction?
It is rated major. Potentially serious — often needs a change or close monitoring.
How quickly could this interaction happen?
The documented onset is "unspecified". The timing of this interaction is not well characterized.
How is the Eletriptan and Amitriptyline interaction managed?
You can usually take both, but your care team will use caution and watch you more closely, especially when starting either drug or increasing a dose. Keep taking both as prescribed unless your doctor or pharmacist tells you otherwise. Doses may be adjusted and individualized by your care team. Learn the warning signs: shivering, muscle twitching or stiffness, fast heartbeat, sweating, fever, agita… Management is individual — always follow your own care team's guidance.
How strong is the evidence for this interaction?
The evidence is graded "theoretical". Predicted from the drugs' pharmacology; not yet confirmed in people.
From our Q&A
Real reader questions about these medications, each personally answered by our pharmacist:
Questions for your pharmacist
- Does my dose of Eletriptan or Amitriptyline need adjusting while I take them together?
- What symptoms should prompt me to call you or my prescriber right away?
- Does the timing of my doses matter for this combination?
- Is there a safer alternative to one of these medications for me?
References (3)
- Boyer EW & Shannon M: The serotonin syndrome. N Eng J Med 2005; 352(11):1112-1120. PubMed
- Product Information: amitriptyline HCl oral tablet, amitriptyline HCl oral tablet. RemedyRepack Inc. (per DailyMed), Indiana, PA, 2010. DailyMed
- Product Information: RELPAX(R) oral tablets, eletriptan hydrobromide oral tablets. Roerig (per DailyMed), New York, NY, 2012. DailyMed
Keep reading about Amitriptyline
Keep reading about Eletriptan
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Prescription drugs aren't the whole picture — herbal and dietary supplements can interact with them too. From the evidence-graded Natural Medicines database:
major · moderate · minor — check everything you take with our drug–supplement interaction checker.
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